They are mods, when you use one it puts your original saves in a different place, it warns you that they may crash, if the game crashed nothing is lost, if you save regularly and want mods, again, nothing is lost, you can add and unload them at any time.

Those texts saying it's not Sony's fault, it's Bethesda. Why should Bethesda do QA on user created mods? That's not how mods have ever worked. If Sony just don't want mods on their system, they should say so, not pretend that's it's the fault of the developers or publishers because they're insisting they take responsibility for someone else's work.